Aberoomand Azar, P.; Zare, K.; Saber-Tehrani, M.; Jafari Kokhedan, A.; Vafaei, A.; Nekoei, M. Chemical Composition of Essential Oil of Stachys Pilifera Benth by Hydrodistillation, Head Space-Solid Phase Microextraction and Solvent Free Microwave Extraction Methods and QSRR Evaluation. ajc 2013, 25, 4242-4246.